I have been watching this for the last couple of days and watched the bid amount rise very quicklly. The seller listed the item as original lettered hilt HH, which leads you to believe it is original, but he did not provide any close up photos of the hilt when he first listed the item for sale, stating he would add better photos later. Today he has added close ups of the inner and outer saber, as you can clearlly see, it is a repro. I hope the bidders realise this before it is too late. It was a great plan the seller had, list it with the mention that the hilt is a lettered hilt HH, which automatically attracted high bids.
I hope that if you are one of the high bidders and you are a member here on RS, this has helped you realize this is a FAKE.
Early Original Vintage Star Wars Double Telescoping Lightsaber Darth Vader 1977 | eBay